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                        HTML
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                            <b>2.</b>
                        
                        CSS
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                        字体属性
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                        文本属性
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                            <b>2.4.</b>
                        
                        盒子box
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                            <b>2.5.</b>
                        
                        浮动float
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                            <b>2.6.</b>
                        
                        定位position
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                            <b>2.7.</b>
                        
                        变形transform
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                            <b>2.8.</b>
                        
                        过渡transition
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                            <b>2.9.</b>
                        
                        阴影shadow
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                            <b>2.10.</b>
                        
                        选择器
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                            <b>2.11.</b>
                        
                        弹性盒子flex
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                            <b>2.12.</b>
                        
                        动画
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                            <b>2.13.</b>
                        
                        拓展内容
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                            <b>3.</b>
                        
                        JS
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                            <b>3.1.</b>
                        
                        if语句
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                            <b>3.2.</b>
                        
                        数据类型的转换
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                            <b>3.3.</b>
                        
                        数值类型Number
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                            <b>3.4.</b>
                        
                        字符串String
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                            <b>3.5.</b>
                        
                        数组Array
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                            <b>3.6.</b>
                        
                        数组的遍历
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                            <b>3.7.</b>
                        
                        filter过滤
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                            <b>3.8.</b>
                        
                        function函数
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                            <b>3.9.</b>
                        
                        定时器
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                            <b>3.10.</b>
                        
                        JS常用事件
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                            <b>3.11.</b>
                        
                        作用域-作用域链
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                            <b>4.</b>
                        
                        响应式Bootstrap
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                            <b>5.</b>
                        
                        ajax
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                            <b>6.</b>
                        
                        swiper
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                            <b>7.</b>
                        
                        变量提升和函数提升
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                            <b>8.</b>
                        
                        浏览器的渲染问题
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                            <b>8.1.</b>
                        
                        回流和重绘
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                            <b>9.</b>
                        
                        小事件
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                            <b>10.</b>
                        
                        创建对象的模式
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                            <b>10.1.</b>
                        
                        工厂模式
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                            <b>10.2.</b>
                        
                        构造函数
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                            <b>10.3.</b>
                        
                        原型模式和混合模式
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                            <b>11.</b>
                        
                        原型链
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                            <b>12.</b>
                        
                        this
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                            <b>13.</b>
                        
                        事件代理/事件委托
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                            <b>14.</b>
                        
                        同步&amp;异步任务
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                            <b>15.</b>
                        
                        防抖&amp;节流
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                            <b>16.</b>
                        
                        ES6
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                            <b>16.1.</b>
                        
                        let/const
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                            <b>16.2.</b>
                        
                        解构赋值
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                            <b>16.3.</b>
                        
                        Promise
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                            <b>16.4.</b>
                        
                        async&amp;await
                    </a>
            
            
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                            <b>16.5.</b>
                        
                        class
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                            <b>16.6.</b>
                        
                        module
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                            <b>16.7.</b>
                        
                        Set
                    </a>
            
            
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        <li class="chapter " data-level="16.8" data-path="md/16ES6/Map.html">
            
                
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                            <b>16.8.</b>
                        
                        Map
                    </a>
            
            
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="17" data-path="md/17garbageCollection/garbageCollection.html">
            
                
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                            <b>17.</b>
                        
                        垃圾回收机制
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="18" data-path="md/18closure/closure.html">
            
                
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                            <b>18.</b>
                        
                        闭包
                    </a>
            
            
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        <li class="chapter " data-level="19" data-path="md/19Vue/vue.html">
            
                
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                        <i class="fa fa-check"></i>
                        
                            <b>19.</b>
                        
                        Vue
                    </a>
            
            
            <ul class="articles">
                
    
        <li class="chapter " data-level="19.1" data-path="md/19Vue/模板语法.html">
            
                
                    <a href="../../md/19Vue/模板语法.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>19.1.</b>
                        
                        模板语法
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="19.2" data-path="md/19Vue/条件渲染.html">
            
                
                    <a href="../../md/19Vue/条件渲染.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>19.2.</b>
                        
                        条件渲染
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="19.3" data-path="md/19Vue/列表渲染.html">
            
                
                    <a href="../../md/19Vue/列表渲染.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>19.3.</b>
                        
                        列表渲染
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="19.4" data-path="md/19Vue/class&amp;style.html">
            
                
                    <a href="../../md/19Vue/class&amp;style.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>19.4.</b>
                        
                        class&amp;style
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="19.5" data-path="md/19Vue/v-model.html">
            
                
                    <a href="../../md/19Vue/v-model.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>19.5.</b>
                        
                        v-model
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="19.6" data-path="md/19Vue/computed.html">
            
                
                    <a href="../../md/19Vue/computed.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>19.6.</b>
                        
                        计算属性
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="19.7" data-path="md/19Vue/watch侦听.html">
            
                
                    <a href="../../md/19Vue/watch侦听.html">
                
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                            <b>19.7.</b>
                        
                        watch侦听
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="19.8" data-path="md/19Vue/filter.html">
            
                
                    <a href="../../md/19Vue/filter.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>19.8.</b>
                        
                        过滤器
                    </a>
            
            
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                            <b>19.9.</b>
                        
                        局部&amp;全局组件
                    </a>
            
            
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        <li class="chapter " data-level="19.10" data-path="md/19Vue/通讯&amp;传递信息.html">
            
                
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                            <b>19.10.</b>
                        
                        通讯&amp;传递信息
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                            <b>19.11.</b>
                        
                        动态组件&amp;keepAlive
                    </a>
            
            
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                            <b>19.12.</b>
                        
                        插槽slot
                    </a>
            
            
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                            <b>19.13.</b>
                        
                        过渡和动画
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                            <b>19.14.</b>
                        
                        生命周期
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                            <b>20.</b>
                        
                        Vue路由router
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                            <b>21.</b>
                        
                        JS面试题
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    <h1>
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        <a href="../../" >小熊的电子书</a>
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                <div class="page-inner">
                
                
                    <section class="normal" id="section-">
                    
                        <h1 id="this">this</h1>
<ul>
<li>this:&#x51FD;&#x6570;&#x6267;&#x884C;&#x65F6;&#x7684;&#x9ED8;&#x8BA4;&#x53C2;&#x6570;&#x4E4B;&#x4E00;&#xFF0C;&#x53E6;&#x4E00;&#x4E2A;&#x65F6;argument</li>
<li>this &#x51FD;&#x6570;&#x6267;&#x884C;&#x65F6;&#x5173;&#x8054;&#x4E0A;&#x4E0B;&#x6587;&#x5BF9;&#x8C61; &#xFF08;&#x51FD;&#x6570;&#x6267;&#x884C;&#x65F6;&#x7684;&#x5BF9;&#x8C61;&#xFF09;</li>
</ul>
<h1 id="&#x51FD;&#x6570;&#x8C03;&#x7528;&#x65B9;&#x5F0F;&#x5BF9;this&#x6307;&#x5411;&#x7684;&#x5F71;&#x54CD;&#xFF1A;">&#x51FD;&#x6570;&#x8C03;&#x7528;&#x65B9;&#x5F0F;&#x5BF9;this&#x6307;&#x5411;&#x7684;&#x5F71;&#x54CD;&#xFF1A;</h1>
<h2 id="&#x4F5C;&#x4E3A;&#x51FD;&#x6570;&#x8C03;&#x7528;"><strong>&#x4F5C;&#x4E3A;&#x51FD;&#x6570;&#x8C03;&#x7528;</strong></h2>
<ul>
<li>&#x975E;&#x4E25;&#x683C;&#x6A21;&#x5F0F;&#x4E0B;&#x4F1A;&#x8F93;&#x51FA;this&#x6307;&#x5411;window&#x5BF9;&#x8C61;&#xFF1B;</li>
<li>&#x4E25;&#x683C;&#x6A21;&#x5F0F;&#x4E0B;,this&#x6307;&#x5411;&#x4E8E;undefined&#x800C;&#x975E;window,&#x9664;&#x975E;&#x4F7F;&#x7528;window.run,&#x90A3;&#x4E48;&#x51FD;&#x6570;&#x5C31;&#x662F;&#x7531;window&#x5BF9;&#x8C61;&#x6765;&#x8C03;&#x7528;&#xFF0C;this&#x81EA;&#x7136;&#x6307;&#x5411;window;</li>
</ul>
<pre><code>    function say() {
        console.log(this);
        }
    say();
    function run() {
        &quot;use strict&quot;; //&#x5F00;&#x542F;&#x4E25;&#x683C;&#x6A21;&#x5F0F;&#xFF0C;&#x4F7F;&#x7528;&#x66F4;&#x52A0;&#x4E25;&#x683C;&#x7684;&#x8BED;&#x6CD5;&#x7684;&#x51C6;&#x5219;;
        // a = 10; //&#x62A5;&#x9519;&#xFF0C;&#x4E25;&#x683C;&#x6A21;&#x5F0F;&#x4E2D;&#x4E0D;&#x5141;&#x8BB8;&#x64CD;&#x4F5C;&#x672A;&#x88AB;&#x58F0;&#x660E;&#x7684;&#x53D8;&#x91CF;&#xFF1B;
        console.log(this); //undefined
              }
     run();
</code></pre><h2 id="callapply"><strong>call,apply</strong></h2>
<ul>
<li>&#x4F7F;&#x7528;call(thisArg)&#x6216;&#x8005;apply(thisArg)&#x65F6;,&#x7B2C;&#x4E00;&#x4E2A;&#x53C2;&#x6570;(thisArg)&#x4F5C;&#x4E3A;&#x51FD;&#x6570;&#x5185;&#x90E8;&#x7684;this;</li>
</ul>
<pre><code> function test() {
        console.log(this);
      }
      let std = {
        age: 18,
      };
      // &#x4F7F;&#x7528;call /apply &#x6765;&#x6267;&#x884C;test&#x51FD;&#x6570;
      test.call(std);
      test.apply(std);
</code></pre><h2 id="&#x4F5C;&#x4E3A;&#x6784;&#x9020;&#x51FD;&#x6570;&#x8C03;&#x7528;">&#x4F5C;&#x4E3A;&#x6784;&#x9020;&#x51FD;&#x6570;&#x8C03;&#x7528;</h2>
<ul>
<li>&#x4F5C;&#x4E3A;&#x6784;&#x9020;&#x51FD;&#x6570;&#x8C03;&#x7528;&#x65F6;&#xFF0C;&#x51FD;&#x6570;&#x5185;&#x90E8;this&#x6307;&#x5411;&#x4E8E;&#x6B63;&#x5728;&#x88AB;&#x521B;&#x5EFA;&#x7684;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;;</li>
<li>&#x6784;&#x9020;&#x51FD;&#x6570;&#x4E2D;&#xFF0C;&#x8FD4;&#x56DE;&#x57FA;&#x672C;&#x7C7B;&#x578B;&#xFF0C;&#x4E0D;&#x4F1A;&#x8986;&#x76D6;return this;</li>
<li>&#x4F46;&#x662F;&#xFF0C;&#x5982;&#x679C;&#x8FD4;&#x56DE;&#x5E94;&#x7528;&#x7C7B;&#x578B;&#xFF0C;&#x5219;&#x4F1A;&#x8986;&#x76D6;&#x539F;&#x6765;return&#x503C;(&#x53D6;&#x4EE3;&#x539F;&#x672C;this&#x7684;&#x8FD4;&#x56DE;)</li>
</ul>
<pre><code>function Cat() {
        console.log(this); //{}
        this.color = &quot;white&quot;;
        console.log(this); //{color:&quot;white&quot;}
        //&#x4E0B;&#x9762;&#x8FD4;&#x56DE; this &#x8FD9;&#x4E00;&#x6B65;&#x64CD;&#x4F5C;&#xFF0C;&#x7531;new&#x64CD;&#x4F5C;&#x7B26;&#x5E2E;&#x6211;&#x4EEC;&#x5B8C;&#x6210;;
        // return this;
      }
      let cat1 = new Cat();
</code></pre><h2 id="&#x4F5C;&#x4E3A;&#x5BF9;&#x8C61;&#x7684;&#x5C5E;&#x6027;&#x8C03;&#x7528;">&#x4F5C;&#x4E3A;&#x5BF9;&#x8C61;&#x7684;&#x5C5E;&#x6027;&#x8C03;&#x7528;</h2>
<ul>
<li>&#x4F5C;&#x4E3A;&#x5BF9;&#x8C61;&#x7684;&#x5C5E;&#x6027;&#x65F6;&#xFF0C;&#x8C01;&#x8C03;&#x7528;&#xFF0C;this&#x5C31;&#x6307;&#x5411;&#x8C01;</li>
</ul>
<pre><code>    let people = {
        hobby = [&apos;&#x7BEE;&#x7403;&apos;,&apos;rap&apos;];
        sayhobby = function(){
            console.log(&quot;&#x7231;&#x597D;&#x662F;:&quot;,this.hobby)
        }
    }

    people.sayhobby();
</code></pre><ol>
<li>&#x4F5C;&#x4E3A;&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x5B9A;&#x4E49;&#x65F6;</li>
</ol>
<pre><code> let obj = {
        age: 18,
        sayThis1: function () {
          console.log(this);
        },
        sayThis2: () =&gt; {
          console.log(this);
        },
      };

      obj.sayThis1(); //obj &#x5BF9;&#x8C61;
      obj.sayThis2(); //window&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x5B9A;&#x4E49;&#x65F6;&#x6240;&#x5728;&#x7684;&#x5BF9;&#x8C61;
      //&#x6B64;&#x5904;&#xFF0C;sayThis2 &#x65F6;obj&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x90A3;&#x4E48;&#xFF0C;&#x5C31;&#x662F;&#x518D;window&#x4E0B;&#xFF0C;&#x5B9A;&#x4E49;&#x4E86;obj&#x5BF9;&#x8C61;&#x548C;&#x5B83;&#x7684;&#x5185;&#x90E8;&#x5C5E;&#x6027;;
</code></pre><h3 id="&#x7BAD;&#x5934;&#x51FD;&#x6570;">&#x7BAD;&#x5934;&#x51FD;&#x6570;</h3>
<ul>
<li>&#x5B9A;&#x4E49;&#x51FD;&#x6570;&#x7684;&#x4E09;&#x79CD;&#x5F62;&#x5F0F;<ol>
<li>&#x51FD;&#x6570;&#x58F0;&#x660E;&#x5F0F; function fn(){}</li>
<li>&#x51FD;&#x6570;&#x8868;&#x8FBE;&#x5F0F; var fn = function(){}</li>
<li>&#x7BAD;&#x5934;&#x51FD;&#x6570;  () =&gt;{}</li>
</ol>
</li>
<li>&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x672C;&#x8EAB;&#x5E76;&#x6CA1;&#x6709;this,arguments;</li>
<li>&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x5185;&#x90E8;&#x7684;this,&#x6307;&#x5411;&#x4E0E;&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x5B9A;&#x4E49;&#x65F6;&#x6240;&#x5728;&#x7684;&#x5BF9;&#x8C61;;</li>
<li><p>&#x4F7F;&#x7528;&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x65F6;&#xFF1A;</p>
<ol>
<li>&#x5F53;&#x5F62;&#x53C2;&#x53EA;&#x6709;&#x4E00;&#x4E2A;&#x65F6;&#xFF0C;&#x5141;&#x8BB8;&#x4E0D;&#x7528;&#x5706;&#x62EC;&#x53F7;&#x5305;&#x88F9;
 (el) =&gt; {} &#x7B49;&#x4EF7;&#x4E8E;  el =&gt; {}</li>
<li><p>&#x5F53;&#x7BAD;&#x5934;&#x53F3;&#x4FA7;&#x4E0D;&#x4F7F;&#x7528;{}&#x5305;&#x88F9;&#x65F6;&#xFF0C;&#x53F3;&#x4FA7;&#x8868;&#x8FBE;&#x5F0F;&#x9ED8;&#x8BA4;&#x4F5C;&#x4E3A;return &#x503C;
 (el) =&gt; { return &apos;abc&apos;} &#x7B49;&#x4EF7;&#x4E8E;  (el) =&gt; &apos;abc&apos;</p>
<pre><code>let stds = [{ age: 19 }, { age: 16 }, { age: 22 }];
// let res = stds.filter(function (el) {
//     return el.age &gt;= 18;
//   });

// &#x7B49;&#x4EF7;&#x4E8E;
let res = stds.filter((el) =&gt; el.age &gt;= 18);
console.log(res);
</code></pre></li>
</ol>
</li>
</ul>
<pre><code> var btn = document.querySelector(&quot;.btn&quot;);
      btn.addEventListener(&quot;click&quot;, function () {
        //&#x666E;&#x901A;&#x51FD;&#x6570;function &#xFF0C;this &#x6307;&#x5411;&#x5F53;&#x524D;DOM&#x5BF9;&#x8C61;
        console.log(this);
      });
      btn.addEventListener(&quot;click&quot;, () =&gt; {
        //&#x7BAD;&#x5934;&#x51FD;&#x6570;&#xFF0C;this&#x7531;&#x51FD;&#x6570;&#x5916;&#x90E8;&#x51B3;&#x5B9A;&#xFF1B;
        //&#x5F53;&#x524D;&#x65F6;&#x95F4;&#x76D1;&#x542C;&#x5B9E;&#x5728; window&#x4E0B;&#x5B8C;&#x6210;&#x7684;&#xFF0C;&#x6240;&#x4EE5;&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x7684;&#x5916;&#x90E8;&#x5BF9;&#x8C61;&#x5373;&#x4E3A;window;
        console.log(this);
      });
</code></pre>
                    
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